Fixed Ruby to use exclude

app/controllers/projects_controller.rb

@@ -262,7 +262,7 @@ class ProjectsController < Projects::ApplicationController
     # If reference is commit id - we should add it to branch/tag selectbox
     ref = params[:ref]
-    if ref && !options.flatten.include?(ref) && ref =~ /\A[0-9a-zA-Z]{6,52}\z/
+    if ref && options.flatten.exclude?(ref) && ref =~ /\A[0-9a-zA-Z]{6,52}\z/
       options['Commits'] = [ref]
     end

app/views/shared/_ref_switcher.html.haml

@@ -6,7 +6,7 @@
   - @options && @options.each do |key, value|
     = hidden_field_tag key, value, id: nil
   .dropdown
-    = dropdown_toggle dropdown_toggle_text, { toggle: "dropdown", selected: @ref || @project.default_branch, ref: @ref, refs_url: refs_namespace_project_path(@project.namespace, @project) }, { toggle_class: "js-project-refs-dropdown" }
+    = dropdown_toggle dropdown_toggle_text, { toggle: "dropdown", selected: dropdown_toggle_text, ref: @ref, refs_url: refs_namespace_project_path(@project.namespace, @project) }, { toggle_class: "js-project-refs-dropdown" }
     .dropdown-menu.dropdown-menu-selectable{ class: ("dropdown-menu-align-right" if local_assigns[:align_right]) }
       = dropdown_title "Switch branch/tag"
       = dropdown_filter "Search branches and tags"